package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.xiaoymin.knife4j.core.util.CollectionUtils;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
	
	@Autowired
	private OrderMapper orderMapper;
	@Autowired
	private OrderDetailMapper orderDetailMapper;
	@Autowired
	private UserMapper userMapper;
	@Autowired
	private AddressBookMapper addressBookMapper;
	@Autowired
	private ShoppingCartMapper shoppingCartMapper;
	@Autowired
	private WebSocketServer webSocketServer;

	/**
	 * 用户下单
	 * @param ordersSubmitDTO
	 * @return
	 */
	public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

		//处理各种业务异常(地址簿为空，购物车为空)
		AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
		if (addressBook == null){
			//抛出业务异常
			throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
		}

		//查询当前用户的购物车数据
		Long userId = BaseContext.getCurrentId();
		ShoppingCart shoppingCart = new ShoppingCart();
		shoppingCart.setUserId(userId);
		List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
		if (shoppingCartList == null || shoppingCartList.size() == 0){
			//抛出业务异常
			throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
		}

		//向订单表插入一条数据
		Orders orders = new Orders();
		BeanUtils.copyProperties(ordersSubmitDTO, orders);
		orders.setOrderTime(LocalDateTime.now());
		orders.setPayStatus(Orders.UN_PAID);
		orders.setStatus(Orders.PENDING_PAYMENT);
		orders.setNumber(String.valueOf(System.currentTimeMillis()));
		orders.setPhone(addressBook.getPhone());
		orders.setConsignee(addressBook.getConsignee());
		orders.setUserId(userId);

		orderMapper.insert(orders);

		List<OrderDetail> orderDetailList = new ArrayList<>();
		//向订单明细表插入多条数据
		for (ShoppingCart cart : shoppingCartList) {
			OrderDetail orderDetail = new OrderDetail();//订单明细
			BeanUtils.copyProperties(cart, orderDetail);
			orderDetail.setOrderId(orders.getId());//设置当前订单明细关联的订单id
			orderDetailList.add(orderDetail);
		}

		orderDetailMapper.insertBatch(orderDetailList);

		//清空当前用户的购物车数据
		shoppingCartMapper.deteleByUserId(userId);

		//封装VO返回结果
		OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
				.id(orders.getId())
				.orderTime(orders.getOrderTime())
				.orderNumber(orders.getNumber())
				.orderAmount(orders.getAmount())
				.build();

		return orderSubmitVO;
	}

	/**
	 * 订单支付
	 *
	 * @param ordersPaymentDTO
	 * @return
	 */
	public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
		// 当前登录用户id
		Long userId = BaseContext.getCurrentId();
		User user = userMapper.getById(userId);

		paySuccess(ordersPaymentDTO.getOrderNumber());

		//调用微信支付接口，生成预支付交易单
//		JSONObject jsonObject = weChatPayUtil.pay(
//				ordersPaymentDTO.getOrderNumber(), //商户订单号
//				new BigDecimal(0.01), //支付金额，单位 元
//				"苍穹外卖订单", //商品描述
//				user.getOpenid() //微信用户的openid
//		);
//
//		if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
//			throw new OrderBusinessException("该订单已支付");
//		}

		OrderPaymentVO vo = new OrderPaymentVO();

		return vo;
	}

	/**
	 * 支付成功，修改订单状态
	 *
	 * @param outTradeNo
	 */
	public void paySuccess(String outTradeNo) {

		// 根据订单号查询订单
		Orders ordersDB = orderMapper.getByNumber(outTradeNo);

		// 根据订单id更新订单的状态、支付方式、支付状态、结账时间
		Orders orders = Orders.builder()
				.id(ordersDB.getId())
				.status(Orders.TO_BE_CONFIRMED)
				.payStatus(Orders.PAID)
				.checkoutTime(LocalDateTime.now())
				.build();

		orderMapper.update(orders);

		//通过WebSocket向客户端浏览器推送消息
		Map map = new HashMap();
		map.put("type", 1);//1表示来单提醒 2表示客户催单
		map.put("orderId", ordersDB.getId());
		map.put("content", "订单号" + outTradeNo);

		String json = JSON.toJSONString(map);
		webSocketServer.sendToAllClient(json);
	}

	/**
	 * 用户端订单分页查询
	 *
	 * @param pageNum
	 * @param pageSize
	 * @param status
	 * @return
	 */
	public PageResult pageQuery4User(int pageNum, int pageSize, Integer status) {
		// 设置分页
		PageHelper.startPage(pageNum, pageSize);

		OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
		ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
		ordersPageQueryDTO.setStatus(status);

		// 分页条件查询
		Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

		List<OrderVO> list = new ArrayList();

		// 查询出订单明细，并封装入OrderVO进行响应
		if (page != null && page.getTotal() > 0) {
			for (Orders orders : page) {
				Long orderId = orders.getId();// 订单id

				// 查询订单明细
				List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);

				OrderVO orderVO = new OrderVO();
				BeanUtils.copyProperties(orders, orderVO);
				orderVO.setOrderDetailList(orderDetails);

				list.add(orderVO);
			}
		}
		return new PageResult(page.getTotal(), list);
	}

	/**
	 * 查询订单详情
	 *
	 * @param id
	 * @return
	 */
	public OrderVO details(Long id) {
		// 根据id查询订单
		Orders orders = orderMapper.getById(id);

		// 查询该订单对应的菜品/套餐明细
		List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

		// 将该订单及其详情封装到OrderVO并返回
		OrderVO orderVO = new OrderVO();
		BeanUtils.copyProperties(orders, orderVO);
		orderVO.setOrderDetailList(orderDetailList);

		return orderVO;
	}

	/**
	 * 用户取消订单
	 *
	 * @param id
	 */
	public void userCancelById(Long id) throws Exception {
		// 根据id查询订单
		Orders ordersDB = orderMapper.getById(id);

		// 校验订单是否存在
		if (ordersDB == null) {
			throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
		}

		//订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
		if (ordersDB.getStatus() > 2) {
			throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
		}

		Orders orders = new Orders();
		orders.setId(ordersDB.getId());

		// 订单处于待接单状态下取消，需要进行退款
		if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
			//调用微信支付退款接口
//			weChatPayUtil.refund(
//					ordersDB.getNumber(), //商户订单号
//					ordersDB.getNumber(), //商户退款单号
//					new BigDecimal(0.01),//退款金额，单位 元
//					new BigDecimal(0.01));//原订单金额

			//支付状态修改为 退款
			orders.setPayStatus(Orders.REFUND);
		}

		// 更新订单状态、取消原因、取消时间
		orders.setStatus(Orders.CANCELLED);
		orders.setCancelReason("用户取消");
		orders.setCancelTime(LocalDateTime.now());
		orderMapper.update(orders);
	}

	/**
	 * 再来一单
	 *
	 * @param id
	 */
	public void repetition(Long id) {
		// 查询当前用户id
		Long userId = BaseContext.getCurrentId();

		// 根据订单id查询当前订单详情
		List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

		// 将订单详情对象转换为购物车对象
		List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
			ShoppingCart shoppingCart = new ShoppingCart();

			// 将原订单详情里面的菜品信息重新复制到购物车对象中
			BeanUtils.copyProperties(x, shoppingCart, "id");
			shoppingCart.setUserId(userId);
			shoppingCart.setCreateTime(LocalDateTime.now());

			return shoppingCart;
		}).collect(Collectors.toList());

		// 将购物车对象批量添加到数据库
		shoppingCartMapper.insertBatch(shoppingCartList);
	}

	/**
	 * 订单搜索
	 *
	 * @param ordersPageQueryDTO
	 * @return
	 */
	public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
		PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());

		Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

		// 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
		List<OrderVO> orderVOList = getOrderVOList(page);

		return new PageResult(page.getTotal(), orderVOList);
	}

	private List<OrderVO> getOrderVOList(Page<Orders> page) {
		// 需要返回订单菜品信息，自定义OrderVO响应结果
		List<OrderVO> orderVOList = new ArrayList<>();

		List<Orders> ordersList = page.getResult();
		if (!CollectionUtils.isEmpty(ordersList)) {
			for (Orders orders : ordersList) {
				// 将共同字段复制到OrderVO
				OrderVO orderVO = new OrderVO();
				BeanUtils.copyProperties(orders, orderVO);
				String orderDishes = getOrderDishesStr(orders);

				// 将订单菜品信息封装到orderVO中，并添加到orderVOList
				orderVO.setOrderDishes(orderDishes);
				orderVOList.add(orderVO);
			}
		}
		return orderVOList;
	}

	/**
	 * 根据订单id获取菜品信息字符串
	 *
	 * @param orders
	 * @return
	 */
	private String getOrderDishesStr(Orders orders) {
		// 查询订单菜品详情信息（订单中的菜品和数量）
		List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

		// 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
		List<String> orderDishList = orderDetailList.stream().map(x -> {
			String orderDish = x.getName() + "*" + x.getNumber() + ";";
			return orderDish;
		}).collect(Collectors.toList());

		// 将该订单对应的所有菜品信息拼接在一起
		return String.join("", orderDishList);
	}

	/**
	 * 各个状态的订单数量统计
	 *
	 * @return
	 */
	public OrderStatisticsVO statistics() {
		// 根据状态，分别查询出待接单、待派送、派送中的订单数量
		Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
		Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
		Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

		// 将查询出的数据封装到orderStatisticsVO中响应
		OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
		orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
		orderStatisticsVO.setConfirmed(confirmed);
		orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
		return orderStatisticsVO;
	}

	/**
	 * 接单
	 *
	 * @param ordersConfirmDTO
	 */
	public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
		Orders orders = Orders.builder()
				.id(ordersConfirmDTO.getId())
				.status(Orders.CONFIRMED)
				.build();

		orderMapper.update(orders);
	}

	/**
	 * 拒单
	 *
	 * @param ordersRejectionDTO
	 */
	public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
		// 根据id查询订单
		Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());

		// 订单只有存在且状态为2（待接单）才可以拒单
		if (ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
			throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
		}

		//支付状态
		Integer payStatus = ordersDB.getPayStatus();
		if (payStatus == Orders.PAID) {
			//用户已支付，需要退款
//			String refund = weChatPayUtil.refund(
//					ordersDB.getNumber(),
//					ordersDB.getNumber(),
//					new BigDecimal(0.01),
//					new BigDecimal(0.01));
//			log.info("申请退款：{}", refund);
		}

		// 拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
		Orders orders = new Orders();
		orders.setId(ordersDB.getId());
		orders.setStatus(Orders.CANCELLED);
		orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
		orders.setCancelTime(LocalDateTime.now());

		orderMapper.update(orders);
	}

	/**
	 * 取消订单
	 *
	 * @param ordersCancelDTO
	 */
	public void cancel(OrdersCancelDTO ordersCancelDTO) throws Exception {
		// 根据id查询订单
		Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());

		//支付状态
		Integer payStatus = ordersDB.getPayStatus();
		if (payStatus == 1) {
			//用户已支付，需要退款
//			String refund = weChatPayUtil.refund(
//					ordersDB.getNumber(),
//					ordersDB.getNumber(),
//					new BigDecimal(0.01),
//					new BigDecimal(0.01));
//			log.info("申请退款：{}", refund);
		}

		// 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
		Orders orders = new Orders();
		orders.setId(ordersCancelDTO.getId());
		orders.setStatus(Orders.CANCELLED);
		orders.setCancelReason(ordersCancelDTO.getCancelReason());
		orders.setCancelTime(LocalDateTime.now());
		orderMapper.update(orders);
	}

	/**
	 * 派送订单
	 *
	 * @param id
	 */
	public void delivery(Long id) {
		// 根据id查询订单
		Orders ordersDB = orderMapper.getById(id);

		// 校验订单是否存在，并且状态为3
		if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
			throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
		}

		Orders orders = new Orders();
		orders.setId(ordersDB.getId());
		// 更新订单状态,状态转为派送中
		orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

		orderMapper.update(orders);
	}

	/**
	 * 完成订单
	 *
	 * @param id
	 */
	public void complete(Long id) {
		// 根据id查询订单
		Orders ordersDB = orderMapper.getById(id);

		// 校验订单是否存在，并且状态为4
		if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
			throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
		}

		Orders orders = new Orders();
		orders.setId(ordersDB.getId());
		// 更新订单状态,状态转为完成
		orders.setStatus(Orders.COMPLETED);
		orders.setDeliveryTime(LocalDateTime.now());

		orderMapper.update(orders);
	}
}
